.wrap
  width: 60%
  margin: 0 20%
  height: 300px
  border: 1px solid red
  overflow: auto
  position: relative
  scroll-behavior: smooth
  li
    height: 30px
    text-align: center
  .visible
    position: absolute
    top: 0
    left: 0
    width: 100%
    background: rgba(0, 0, 0, 0.3)
